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MERGE docs adjustments 

Per Justin Pryzby

Discussion: https://postgr.es/m/20220801145257.GA15006@telsasoft.com
Discussion: https://postgr.es/m/20220714162618.GH18011@telsasoft.com
This commit is contained in:
Alvaro Herrera 2022-08-12 13:16:50 +02:00
parent 92af9143f1
commit 3d895bc846
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2 changed files with 5 additions and 8 deletions
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3
doc/src/sgml/mvcc.sgml
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@ -402,7 +402,8 @@
and a unique index is present and a duplicate row is concurrently
inserted, then a uniqueness violation error is raised;
<command>MERGE</command> does not attempt to avoid such
errors by evaluating <literal>MATCHED</literal> conditions.
errors by restarting evaluation of <literal>MATCHED</literal>
conditions.
</para>
<para>

10
doc/src/sgml/ref/merge.sgml
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@ -266,10 +266,6 @@ DELETE
filled with a default value, either its declared default value
or null if there is none.
</para>
<para>
If the expression for any column is not of the correct data type,
automatic type conversion will be attempted.
</para>
<para>
If <replaceable class="parameter">target_table_name</replaceable>
is a partitioned table, each row is routed to the appropriate partition
@ -581,12 +577,12 @@ WHEN NOT MATCHED THEN
<programlisting>
MERGE INTO CustomerAccount CA
USING (Select CustomerId, TransactionValue From RecentTransactions) AS T
ON CA.CustomerId = T.CustomerId
ON T.CustomerId = CA.CustomerId
WHEN MATCHED THEN
UPDATE SET Balance = Balance + TransactionValue;
WHEN NOT MATCHED THEN
INSERT (CustomerId, Balance)
VALUES (T.CustomerId, T.TransactionValue)
WHEN MATCHED THEN
UPDATE SET Balance = Balance + TransactionValue;
</programlisting>
</para>